The word "不复" is formed by directly combining the character "不", which functions as a negator meaning "not", with the character "复", which carries core meanings of repetition, return, or restoration. This pairing creates a compound where the negation modifies the action implied by "复", resulting in a single adverbial unit that literally translates to "not again" or "no longer", used to indicate that a previous action or state has ceased and does not recur.